Mourners heading Mashhad to mark Imam Reza's martyrdom

Millions of mourners converged on Iran’s holy city of Mashhad to mark the martyrdom anniversary of Imam Reza, the eighth Shia Imam.
Muslims from several other countries moved to Mashhad to attend the mourning ceremonies at Imam Reza's shrine.
Imam Reza was martyred after being poisoned by the Abbasid Caliph Ma’mun on the last day of the Islamic lunar month of Safar, in the year 818 AD.